🇺🇸 Marlboro County Jetport - H E Avent Field Airport

Information about Marlboro County Jetport - H E Avent Field Airport (KBBP (BTN)) was not found in the provided search results. Therefore, I cannot provide verified facts about its type, location, runway information, known uses, or historical significance.

However, the search results did provide information on several other small, private airports in the US:

• Flying Dollar Ranch Airport (9WI2): A privately-owned, private-use airfield located approximately one mile southwest of Maribel, Wisconsin. It has one turf runway (N/S) measuring 1,500 by 150 feet, with an elevation of 840 feet.
• Quatro Ranch Airport (US-4207): A private ranch airstrip near Crystal City, Texas, in Dimmit County. It has two grass runways (17 and 35), both 3,000 feet long, and an elevation of 505-510 feet MSL. Some sources list it as "Quatro Ranch Airport (historical)".
• Country Air Estates Airport (1AR9): A privately-owned, private-use airfield located approximately 5 miles northwest of Lonoke, Arkansas. It features two turf runways: 18/36 (3,800 x 100 feet) and 11/29 (2,500 x 100 feet), with an estimated elevation of 250 feet.
• Santa Margarita Ranch Airport (US-0248): A private airport/airfield located in Santa Margarita, California, with an elevation of 987 feet. It has one asphalt runway (17/35) measuring 3,230 x 50 feet.
• Marmande Airport (US-3785): A small, privately owned airfield in Theriot, Louisiana. It has a single turf runway (16/34) measuring 3,491 x 100 feet, with a field elevation of 8 feet.

*Sources researched: airportroutes.com*